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This article provides information on "Upgrading to Windows 10 on Precision Desktops Fail Without PERC Drivers".

Perc Drivers

If you are trying to upgrade from Windows 7 / 8.1 to Windows 10 using the GWX tool from Microsoft on a Precision Desktop but are having recovery messages or other "storage device not available" related issues. You will need to inject the proper Intel Rapid Storage for Enterprise drivers while running the upgrade.